EP0694648B1 - Verfahren und Vorrichtung zum trocknen oder kühlen von Papierbahnen oder dergleichen - Google Patents

Verfahren und Vorrichtung zum trocknen oder kühlen von Papierbahnen oder dergleichen Download PDF

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Publication number
EP0694648B1
EP0694648B1 EP95850117A EP95850117A EP0694648B1 EP 0694648 B1 EP0694648 B1 EP 0694648B1 EP 95850117 A EP95850117 A EP 95850117A EP 95850117 A EP95850117 A EP 95850117A EP 0694648 B1 EP0694648 B1 EP 0694648B1
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EP
European Patent Office
Prior art keywords
roll
web
gas
support
openings
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EP95850117A
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English (en)
French (fr)
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EP0694648A3 (de
EP0694648A2 (de
Inventor
Vesa Vuorinen
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Valmet Oy
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Valmet Oy
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Publication of EP0694648A3 publication Critical patent/EP0694648A3/de
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders

Definitions

  • the invention concerns a method in drying and/or cooling of a paper or board web, in which method the web is passed over the circumference of a revolving roll or equivalent on support of a support wire or equivalent on the face of the support wire or equivalent that is placed facing the roll, in which method the web is dried and/or cooled by means of a gas.
  • the invention concerns a device in drying and/or cooling of a paper or board web and/or telt, which device is composed of a roll or equivalent, which roll is revolving and which roll is provided with openings placed in the mantle, and in the interior of which roll a system of gas ducts has been formed, the web to be dried being fitted to run over the circumference of the roll preferably on support of a support wire or equivalent.
  • FR-A-2 399 504 discloses a device according to the preamble of claim 9.
  • twin-wire-draw and/or single-wire draw is/are employed.
  • the groups of drying cylinders comprise two wires, which press the web, one from above and the other one from below, against the heated cylinder faces. Between the rows of cylinders, which are usually horizontal rows, the web has free and unsupported draws, which are susceptible of fluttering, which may result in web breaks.
  • each group of drying cylinders comprises one drying wire only, on whose support the web runs through the whole group so that, on the drying cylinders, the drying wire presses the web against the heated cylinder faces, and on the reversing cylinders between the drying cylinders the web remains at the side of the outside curve.
  • the drying cylinders are placed outside the wire loop, and the reversing cylinders inside the loop.
  • the heated drying cylinders are placed in the upper row, and the reversing cylinders are placed in the lower row, said rows being, as a rule, horizontal and parallel to one another.
  • So-called inverted groups with single-wire draw are also known, in which the heated drying cylinders are placed in the lower row and the reversing suction cylinders or rolls in the upper row, the substantial objective being to dry the web from the side opposite in relation to a normal group with single-wire draw.
  • a dryer for drying a continuous paper-fibre sheet In said dryer, there is a rotatable drum and means for feeding dry gas into the interior of this rotatable drum and means for making the gas to flow out of the rotatable drum.
  • the material to be dried is not supported by a wire or equivalent, and the material to be dried runs around the drum on support of strips.
  • the drying gas spreads onto the face of the material to be dried along particular passages placed on the face of the drum, in which passages the gas can spread in the direction of the circumference only, because the strips for supporting the material to be dried separate the passages from one another.
  • the trapeze-like strips parallel to the circumference intensify the flow of the drying gas in the direction parallel to the circumference.
  • the gas distribution equipment is stationary, i.e. the leakages from the drying gas to the outlet gas take place inside the drum. This results in a certain percentage of loss of gas.
  • the object of the present invention is to provide a method and a device in drying of a paper web in which method and device the problems described above have been eliminated or at least minimized.
  • drying and/or cooling gas is blown through openings that have been made into the mantle of the roll into the space between the outer face of the roll and the web supported by the support wire, whereby a support zone formed by pressurized gas is formed between the outer face of the roll and the web, and that in the method the humidified gas is passed out of the support zone into the interior of the roll through openings that have been made into the mantle of the roll, into a system of exhaust ducts placed inside the roll.
  • drying gas is blown, through openings that have been made into the roll mantle, between the outer face of the roll and the web supported by the support wire.
  • An air cushion is formed between the outer face of the roll and the web, the counter-force required by said cushion being produced by using the tension force of the wire as an aid.
  • the humidified gas is passed out of the air cushion into the roll interior through openings that have been made into the outer circumference of the roll, into the system of exhaust ducts placed inside the roll.
  • the device in accordance with the invention is mainly characterized in that, into the roll mantle, blow openings have been fitted so as to form a support zone formed by pressurized gas between the outer face of the roll and the web to be dried, and that in the mantle of the roll, there is a second set of openings for removal of the humidified gas and passing the gas into a system of exhaust ducts placed inside the roll.
  • the gas is blown directly against the material to be dried, and the exhaust gas is removed directly between the holes or slots. Owing to the unified construction of the roll or drum that forms the device, no gas is lost, i.e. there is no loss percentage.
  • a dryer section is obtained whose length is even just half the length of the dryer section in the prior-art solutions.
  • the geometry of the dryer group can be constructed in accordance with the requirements of the wet end of the machine.
  • the arrangement in accordance with the invention does not require extensive investments, and it can also be used in modernizations of existing paper machines.
  • the arrangement in accordance with the invention is easy to operate, because the devices can be placed in a number of different ways so that, for example, the present, conventionally known tending platform is employed. All points of discontinuity, such as group gaps, are placed at viewing height from the tending platform.
  • the running and the mode of drying in accordance with the invention permit the use of rolls of large diameter and even rolls of different diameters in one group. They permit a machine geometry in which the runnability can be improved and the machine speed be increased further.
  • blowing from the drum is needed during drying only, the auxiliary operations (such as threading) can be carried out without blowing of gas or heating. In this way the consumption of energy is minimized and the external conditions are improved.
  • the rolls have common or individual drives.
  • An individual drive of a roll permits a circumferential speed of the roll different from the speed of the web. This possibility prevents, for example, blow marking.
  • a pervious or impervious wire is used.
  • the wire may be heat-conductive or non-conductive.
  • the range of the material to be dried may vary from the thickest board grades to thinner printing papers, tissue paper, or any material whatsoever to be dried that can be bent around the drum.
  • the method and the device in accordance with the invention are described mainly as applied to the dryer section of a paper machine, it is understood that the invention is also suitable for drying applications of other types, such as drying a coating on a paper or equivalent, in which, at the side of the coating, there must be a contact-free draw, and, for example, drying of felts or equivalent, drying of various web-like materials from the thickest board grades to the thinnest printing paper, the only limitation being the flexibility of the material to be dried.
  • the device in accordance with the invention that is shown in Figs. 1A...1B is a roll 10, cylinder, drum, or equivalent, whose mantle 12 is provided with holes 44,46.
  • a drying gas P in is passed, which is blown through the holes 44 onto the face of the material W to be dried, such as paper. Since the paper W is supported by the wire 15, a pressure is produced between the outer face of the roll 10 and the paper W.
  • a suitable compression pressure By means of a suitable compression pressure, the paper W is separated from the roll 10 face, which permits a flow of the drying gas, which is usually heated air, from the inlet holes 44 into the outlet holes 46, and the drying process proper is carried out.
  • a support zone formed by pressurized gas a so-called air cushion 11 is produced between the outer face of the roll 10 and the paper W supported by the wire 15, which air cushion supports and dries the paper W.
  • the gas/air that is blown is dry and heated and, thus, binds humidity.
  • the blow pressure is 500 Pa ... 10,000 Pa, preferably 1000 Pa ... 5000 Pa, and the temperature of the drying gas is 20 °C ... 500 °C, preferably 100 °C ... 400 °C.
  • the humid gas is removed from the support zone 11 through the outlet holes 46 placed between the blow holes 44.
  • the blow holes 44 extend almost across the entire width of the paper W, but the suction holes do not, because a control of the lateral areas of the paper W requires an outflow P Z between the roll 10 face and the paper W in this exemplifying embodiment of the invention.
  • the rest of the roll 10 face, except the gas flow openings 44,46, may be smooth or grooved.
  • the grooves may be placed in the longitudinal direction or in the cross direction of the roll 10 mantle, or between said directions, i.e. diagonal.
  • the grooves may also be radial in relation to the blow or exhaust openings 44,46.
  • the drying gas P in is passed through the system of ducts 13 through the holes 44 in the face of the roll 10 mantle 12 into the zone between the outer face of the roll 10 and the paper W, in which zone an air cushion 11 is formed. Since there are no exhaust holes 46 in the end area A S of the roll mantle, the exhaust air P Z is discharged out of the gap between the roll 10 face and the paper W into the stationary outlet 35. In the middle area A 1 of the roll 10 mantle 12, between the intake holes 44, there are exhaust holes 46, through which the gas that has bound the moisture of the paper W is removed along the system of exhaust ducts 14 to the interior of the roll 10 and from there further out as the exhaust gas P out .
  • the paper web W that is supported by the wire 15 is guided over the guide roll 61 onto the face of the drying roll 10.
  • the roll revolves in the sense indicated by the arrow S and, after the paper W has passed, on support of the wire 15, around the substantial circumferential area of the roll 10, it is passed by means of the other guide roll away from the roll face to further drying or to finishing.
  • the area that is not covered by the web W is closed by means of a closing member 25.
  • the roll 10 revolves at a speed substantially equivalent to the running speed of the paper web and the wire.
  • the speed of rotation of the roll can be slowed, and the rotation of the roll 10 can be even stopped.
  • Figs. 2A...2B the supply P in of the drying gas into the roll 10 is accomplished through the openings 16 placed at the ends of the roll 10, two different exemplifying embodiments of said openings being illustrated in Figs. 4A...4B.
  • Fig. 2A for the sake of example, a slot-shaped blow opening 45 and a slot-shaped exhaust opening 47 are also shown.
  • FIG. 2B is a schematic longitudinal sectional view of the roll 10. Below the wire 15, there is the paper web W, below which an air-cushion zone of about 0.5...10 mm, preferably 2...4 mm, is formed.
  • the diameter of the blow holes 44 in the roll 10 mantle 12 is about 1.0...10 mm, preferably 2...5 mm, and the diameter of the exhaust-air holes is about 10...100 mm, preferably 20...60 mm.
  • slot-shaped blow openings When slot-shaped blow openings are used, their length is substantially equal to the width of the paper web, and their width is 1.0...20 mm, preferably 2.0...6.0 mm, and the length of the slot-shaped exhaust openings is shorter than the width of the paper web, and their width is 5.0...50 mm, preferably 10.0...25 mm.
  • the diameter of the blow roll 10 is 0.5...10.0 m, preferably 1.5...6.0 m.
  • Fig. 2C illustrates the operation of a single blow hole 44.
  • a carrier-face zone i.e. a so-called air cushion 11, is formed, whose thickness is 0.5...10 mm, preferably 1.5...5 mm, and the gas can flow in the hole 44.
  • the gas collides against the material W to be dried at a velocity of 30...150 m/s, preferably 50...120 m/s, and turns then so that it becomes parallel to the material W to be dried.
  • water is bound from the material W to be dried to the gas. This cooled gas of higher humidity is passed out through separate exhaust holes 46.
  • the dimensioning of the amount of gas to be blown is based on the consumption of blowing energy in comparison to the heat-transfer coefficient that is obtained.
  • the optimal area of the holes is indicated as a percentage of the whole area of the roll 10 mantle 12. The values that are used are 0.2...5 %, preferably 0.5...2.5 %.
  • the covering angle is, as a rule, 180...350°, preferably 250...330°.
  • the blow openings in the roll 10 mantle 12 may be straight openings 44 or openings 44'' or 44"' provided with a widening.
  • the size of the opening for the inlet gas of the roll 10 and of the opening for the outlet gas, placed at the opposite end of the roll 10, as shown in Figs. 1B and 2A, has been chosen so that the velocity of the gas at the opening is 5 m/s ... 50 m/s, preferably 15 m/s ... 35 m/s.
  • Figs. 3A...3B show exemplifying embodiments in which the effective part of the paper W and the wire 15 are supported by the air cushion 11, and the edges of the wire 15 (FIG. 3A) or the edges both of the paper W and of the wire 15 (FIG. 3B) are supported by the support faces 17 formed on the mantle part 12 of the blow roll 10.
  • all the exhaust air is passed out of the area of the air cushion 11 through the exhaust openings 46.
  • Figs. 2B, 3A and 3B illustrate the most important exemplifying embodiments of the invention:
  • Fig. 2B shows a method in which a smooth roll face is employed, in which case a part of the gas is removed as the exhaust flow P Z from the lateral areas of the roll 10, where both the wire 15 and the paper W are completely supported by the air cushion 11; in the embodiment shown in Fig. 3A, the paper W is completely supported by the air cushion 11, but the wire 15 is supported on the support faces 17, and in Fig. 3B both the paper web W and the wire 15 are supported by the support faces 17.
  • the blow air or gas is passed into the roll 10 through the duct 41 into the system of ducts 13 and further into the blow openings 44, and the humidified exhaust gas is passed through the system of ducts 14 to the exhaust 43 through the exhaust pipes or passages 46 out of the roll 10.
  • the wire 15 guide members 51 are attached to the ends in the lateral areas of the roll 10 mantle 12, and their 51 positions are adjustable.
  • the wire guides 52 have been formed as fixed in the lateral areas of the roll 10 mantle 12.
  • the wire guides or guide faces should not be confused with the support faces described above.
  • Fig. 5A is a sectional view taken along the line A-A in Fig. 4A, wherein the system of air ducts 13 placed inside the roll 10 are shown, which ducts 13 pass into the blow openings 44, and the system of exhaust ducts 14, into which the humidified gas is passed through the exhaust openings 46.
  • Fig. 5B is a schematic sectional view taken along the line B-B in Fig. 4B, in which drying gas is passed out of the duct 13 through two blow openings 44 out through the roll 10 mantle face 12, and the humidified air is removed through the exhaust openings 46 to inside the roll 10 mantle face 12.
  • the closing member 25 may be a separate device, such as is shown in the figures, or the area is closed in the longitudinal direction between the reversing rolls 61 (Fig. 1) and in the cross direction by means of ends (not shown) formed by the blow roll 10 and the reversing rolls 61.
  • the closing member 25 includes a sealing against the blow roll 10, which sealing is carried out by means of a mechanical seal 26 or by means of a sealing counter-blowing 27. In the sealing counter-blowing 27, blower air or compressor air is employed.
  • the counter-blowing device may be integrated, e.g., with the closing member 25, or it may be a separate device.
  • the cleaning of the blow roll 10 takes place by means of counter-blowing P 1 against the roll 10 face.
  • the cleaning equipment 28 may be placed in the closing member 25 or be a separate device.
  • Fig. 7 shows the flow diagram of the drying gas, such as heated air. Since the air-cushion principle requires that the drying gas is also pressurized at the discharge opening 46, the state of the entire gas of higher humidity that is discharged is pressurized. Thus, the whole of the interior of the revolving blow roll 10 and the gas distributor devices outside said roll are pressurized.
  • the system requires just one blower 37 to feed the gas. By regulating the blower system 37, the desired pressure state of the gas is obtained by means of the regulator 67, or the gas flow is obstructed at the discharge side by means of the regulator 49.
  • the gas that is discharged can be passed, for example, through heat recovery to the open air, or a part of the gas can be recirculated to among the gas to be blown in.
  • the reference numeral 29 denotes the stationary gas distributor equipment, which is sealed in relation to the roll 10 by means of the seals 38.
  • the gas flow is illustrated by means of arrows.
  • the drying gas is passed into the drying-gas inlet 41 in the gas distributor equipment 29 of the roll, from which it is passed through the set of ducts 13 into the blow holes 44.
  • the humidified gas, which is removed through the exhaust holes 46, is passed through the set of exhaust ducts 14 to the outlet 43, from which it is passed further through the gas distributor equipment 42 to the outlet duct 48, which is provided with a regulation member 49 and from which the gas is passed to the open air or a part of the gas is recirculated to among the gas to be blown in, into the duct 68.
  • the solid line represents the material W to be dried, which is usually paper, board or equivalent
  • the dashed line represents the blow roll 10 and the guide roll 61, which may be smooth, grooved, or a suction roll
  • the dashed-dotted line represents the support band 15, which is most commonly a wire or equivalent.
  • Figs. 8A...8D illustrate exemplifying embodiments in which twin-wire draw is employed.
  • the upper wire is denoted with the reference 15y and the lower wire with 15a.
  • the wire guide rolls are denoted with the reference numeral 61.
  • the closing member of the free portion of the roll 10 is denoted with the reference numeral 25.
  • Fig. 8A in connection with the roll 10, one intermediate roll 61 has been fitted in the embodiment shown to the left, and two intermediate rolls 61 in the embodiment shown to the right.
  • two intermediate rolls 61 are employed, a better support of the paper W is obtained over the free gap W 0 .
  • the effective blow area of the blow roll 10 has been maximized, in which case a closing member 25 is needed in a little area only, and a greater number of blow rolls 10 can be placed in the same wire group.
  • the group has a closed draw, i.e. the paper W is constantly supported by a wire 15a, 15y.
  • Fig. 8C shows an embodiment that is mainly similar to Fig. 8B, but an open draw is employed, in which the paper W is transferred from one blow roll 10 onto the other without a wire, as open draws W 0 .
  • Fig. 8D shows a twin-wire draw in which the effective blowing of the blow roll 10 has been maximized and in which a greater number of blow rolls 10 can be fitted in the same wire group.
  • a closed draw is employed, and a geometry of low height is obtained, because the blow rolls 10 are placed close to one another in the vertical direction.
  • auxiliary rolls 58 are employed in order to guide the wire 15a, 15y.
  • Fig. 9A shows an embodiment in which, in single-wire draw, one intermediate roll 61 is fitted in connection with the roll 10.
  • Fig. 9B shows an embodiment in which, in single-wire draw, there are two intermediate rolls 61 in connection with the roll 10, by whose means a large coverage of the blow roll 10 is obtained.
  • Fig. 9C shows an inverted arrangement with single-wire draw, in which, in connection with the blow roll 10, the wire 15 is guided by two intermediate rolls 61, in which arrangement an advantage is the large coverage of the blow roll.
  • Fig. 9D shows an inverted arrangement with single-wire draw, in which the wire 15 is guided by one intermediate roll 61 fitted as interlocked between the blow rolls 10.
  • the support band 15 is the member that receives the blowing.
  • the band 15 should preferably be capable of conducting heat, in which case the drying or cooling effect is transferred to the paper W by the intermediate of the band 15, and, in order that it could be secured that the material to be dried remains in contact with the band, the band is preferably impenetrable by air.
  • This mode of running may also be employed with such materials to be dried as require an adequate contact with the support band both in the longitudinal direction of the web and in the cross direction so as to guarantee the quality or equivalent.
  • the web W is passed from the blow roll 10 of the upper row onto the blow roll 10 of the lower row and so forth.
  • the paper web W is placed outside.
  • Fig. 10B an exemplifying embodiment based on a geometry with single-wire draw is shown, in which, in order to increase the coverage proportion and to guide the band or the wire 15, intermediate rolls 61 are employed. On the blow roll 10 in the lower row, the paper web W is placed outside. By means of this solution, a good coverage but a rather high geometry are obtained.
  • a device 69 in respect of the paper placed outside on the blow rolls 10 in the upper row, a device 69 is used that applies a normal stationary drying technique, for example infrared drying, blowing or equivalent or cooling, and, if necessary, such a device can also be employed in the other exemplifying embodiments shown in the figures.
  • the embodiments shown in Figs. 10C...10D are similar to those shown in Figs. 10A... 10B, even if, in them the paper web W is outside on the upper-row blow roll.
  • blow roll in accordance with the invention is well suitable for the drying of a coating on paper or equivalent, in which case it is desirable to use so-called contact-free drying at the side to be dried (FIG. 13). Drying by means of a blow roll can also be applied to the current steam-heated cylinder geometries, and stationary heating can be carried out, for example, by means of blow, infra, or equivalent separate devices, which can be applied to all the geometries illustrated in the following Figs. 11A...11R, in which the rolls in the dryer group arrangements in themselves known are denoted with the reference numeral 73.
  • Fig. 11A shows an embodiment with single-wire draw, in which the wire 15 supports the web W that runs over the blow roll 10.
  • the effective blow angle of the blow roll 10 is the same as with the other cylinders 73.
  • Fig. 11B shows a single-wire draw in which the wire 15 guides the web W over the blow roll 10, in connection with which two intermediate rolls 61 are fitted. The effective blow angle of the blow roll 10 has been maximized.
  • a stationary dryer device 69 is also used.
  • the effective blow angle of the blow roll 10 is the same as that of the cylinders 73.
  • Fig. 11E shows an embodiment inverted in comparison to that shown in Fig. 11A.
  • Fig. 11F The solution of Fig. 11F is similar to Fig. 11B as inverted.
  • Fig. 11G is similar to Fig. 11C as an inverted arrangement.
  • Fig. 11H shows an inverted arrangement corresponding to Fig. 11D.
  • Fig. 11I shows an embodiment with twin-wire draw in which the effective blow angle of the blow roll 10 is the same as with the other cylinders 73.
  • Fig. 11J shows an embodiment with twin-wire draw in which the effective blow angle of the blow roll 10 has been maximized.
  • Fig. 11K shows an embodiment with twin-wire draw in which the effective blow angle of the blow roll is the same as with the other cylinders.
  • blow roll 10 is placed in the upper row of cylinders, the rest being similar to Fig. 11I.
  • blow roll 10 is placed in the upper row of cylinders, the rest being similar to Fig. 11J.
  • blow roll 10 is placed in the upper row of cylinders, the rest being similar to Fig. 11K.
  • Fig. 11P corresponds to Fig. 11L as an embodiment with twin-wire draw, the blow roll 10 being placed in the upper row.
  • Fig. 11Q illustrates an application to a prior-art existing dryer section in which steam-heated drying cylinders 73 are used.
  • the figure shows an embodiment with twin-wire draw, in which an upper wire 15 y and a lower wire 15 a are employed, and the arrangement in accordance with the present invention has been accomplished in connection with the lower wire 15 a , where a blow roll 10 in accordance with the invention is placed, which roll 10 is preferably placed in the place of the first or last cylinder in a normal dryer group.
  • Fig. 11R shows an embodiment corresponding to Fig. 11Q, in which the blow roll 10 is placed in connection with the upper wire 15 y .
  • One blow roll 10 can also form a group of its own. In the dryer section, there may be several such groups, either with an upper wire or with a lower wire.
  • a blow roll 10 in accordance with the invention may also be used for the drying of various felts and equivalent materials.
  • the press felts of paper machines that are used currently.
  • the felt 80 to be dried is pervious to air or impervious, nor is the thermal conductivity of the felt of decisive importance.
  • the drying takes place partly as through blowing.
  • the rest of the drying like the drying of paper, takes place by the air-cushion principle provided by means of a roll 10 in accordance with the invention.
  • Fig. 13 shows an embodiment in which an arrangement in accordance with the invention is used in the drying of a coated paper web W or equivalent.
  • the coated side C of the paper web W runs as a contact-free draw over the blow rolls 10 on support of the wire 15 and carried by the air cushion 11.

Claims (13)

  1. Verfahren zum Trocknen und/oder Kühlen einer Papier- oder Kartonbahn, in welchem Verfahren die Bahn (W) über den Umfang einer drehbaren Walze (10) abgestützt auf einem Stützsieb (15) oder Band auf der, der Walze (10) zugewandt platzierten Fläche des Stützsiebes (15) passiert wird, in welchem Verfahren die Bahn (W) mit Hilfe eines Gases getrocknet und/oder gekühlt wird, wobei in dem Verfahren Trocknungs- und/oder Kühlgas durch Öffnungen (44; 45), die in den Mantel (12) der Walze (10) eingearbeitet worden sind, in den Raum zwischen der Außenfläche der Walze (10) und der mittels des Stützsiebes (15) oder Bandes gestützten Bahn (W) geblasen wird, wodurch eine durch druckbeaufschlagtes Gas gebildete Stützzone (11) zwischen der Außenfläche der Walze (10) und der Bahn (W) gebildet wird, und in dem Verfahren das befeuchtete Gas aus der Stützzone (11) in das Innere der Walze (10) durch Öffnungen (46; 47) passiert wird, die in den Mantel (12) der Walze (10) eingearbeitet worden sind, dadurch gekennzeichnet, dass das befeuchtete Gas durch die Öffnungen (46; 47) in ein System von Ausströmkanälen passiert wird, die innenseitig der Walze (10) platziert sind.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in dem Verfahren die zu trocknende Bahn (W) derart passiert wird, dass sie abgestützt auf einer Stützzone (11) in einem Abstand zu der Fläche der Walze (10) verläuft.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in dem Verfahren eine dünne Stützzone (11) gebildet wird, deren Dicke 0,5 bis 10 mm, bevorzugt 2 bis 4 mm beträgt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die druckbeaufschlagte Stützzone (11), die zwischen der Walze (10) und der Bahn (W) gebildet wird, mit Hilfe der Gegenkraft der Spannung des Stützsiebes (15) oder Bandes erzeugt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Geschwindigkeit der Bahn (W) auf der Grundlage der Geschwindigkeit des Stützsiebes (15) oder Bandes bestimmt wird, in welchem Falle die Geschwindigkeit der Walze (10) unterschiedlich zu der Geschwindigkeit der Bahn (W) sein kann.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass in der Stützzone (11) ein wärmeleitfähiges Stützsieb (15) oder Band, das gasundurchlässig ist, erwärmt wird, wobei die Wärme als Kontakttrocknung von dem Stützsieb (15) oder Band zu der zu trocknenden Bahn (W) transferiert wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass in dem Verfahren der freie Abschnitt des Außenumfanges (12) der Walze (10) zugemacht wird, um die Stützzone (11) daran zu hindern, ausgelassen zu werden.
  8. Verfahren zum Trocknen und/oder Kühlen eines Filzes, in welchem Verfahren der Filz (80) über den Umfang einer drehbaren Walze (10) oder eines Zylinders oder einer Trommel passiert wird, in welchem Verfahren der Filz (80) mit Hilfe eines Gases getrocknet und/oder gekühlt wird, wobei in dem Verfahren Trocknungsgas durch Öffnungen (44; 45), die in den Mantel (12) der Walze (10) eingearbeitet worden sind, in den Raum zwischen der Außenfläche der Walze (10) und dem Filz (80) geblasen wird, wodurch eine durch druckbeaufschlagtes Gas gebildete Zone (11) zwischen der Außenfläche der Walze (10) und dem Filz (80) gebildet wird, und in dem Verfahren das befeuchtete Gas aus der Stützzone (11) in das Innere der Walze (10) durch Öffnungen (46; 47) passiert wird, die in den Mantel (12) der Walze (10) eingearbeitet worden sind, dadurch gekennzeichnet, dass das befeuchtete Gas durch die Öffnungen (46; 47) in ein System von Ausströmkanälen passiert wird, die innenseitig der Walze (10) platziert sind.
  9. Vorrichtung zum Trocknen und/oder Kühlen einer Papier- oder Kartonbahn und/oder eines Filzes, welche Vorrichtung aus einer Walze (10) besteht, welche Walze (10) drehbar ist und welche Walze (10) mit Öffnungen (44, 46; 47, 45) versehen ist, die in dem Mantel (12) platziert sind, wobei in dem Inneren der Walze (10) ein System von Gaskanälen (13, 14) gebildet worden ist, und die zu trocknende Bahn (W) und/oder der Filz angepasst ist/sind, um über den Umfang der Walze (10) bevorzugt abgestützt auf einem Stützsieb (15) oder Band zu verlaufen, wobei in dem Mantel (12) der Walze (10) Blasöffnungen (44; 45) eingepasst worden sind, um eine durch druckbeaufschlagtes Gas gebildete Stützzone (11) zwischen der Außenfläche der Walze (10) und der zu trocknenden Bahn (W) oder dem Filz zu bilden, und in dem Mantel (12) der Walze (10) ein zweiter Satz von Öffnungen (46; 47) zum Abzug des befeuchteten Gases vorhanden ist, dadurch gekennzeichnet, dass der zweite Satz von Öffnungen (46; 47) das befeuchtete Gas in ein System von innenseitig der Walze (10) platzierten Ausströmkanälen passiert.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass in Verbindung mit der Walze (10) ein Absperrelement (25) angepasst ist, welches an dem freien Abschnitt der Walze (10) platziert ist, um zu verhindern, dass die Stützzone (11) ausgelassen wird.
  11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass in der Außenfläche des Mantels (12) der Walze (10), und zwar in ihren Seitenbereichen, Bandführungen (51) angebracht sind.
  12. Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass die Seitenbereiche der Außenfläche der Walze (10) als Stützflächen (17) ausgebildet worden sind, die die Ränder des Stützsiebes oder Bandes (15) tragen, das das zu trocknende Material (W) stützt.
  13. Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass in den Seitenbereichen der Außenfläche der Walze (10) Stützflächen (17) ausgebildet worden sind, die die Ränder des zu trocknenden Materials (W) und des Stützsiebes tragen, das das Material (W) stützt.
EP95850117A 1994-06-23 1995-06-22 Verfahren und Vorrichtung zum trocknen oder kühlen von Papierbahnen oder dergleichen Expired - Lifetime EP0694648B1 (de)

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FI943040 1994-06-23
FI943040A FI102624B1 (fi) 1994-06-23 1994-06-23 Menetelmä ja laite paperiradan tai vastaavan kuivatuksessa tai jäähdytyksessä

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EP0694648A3 EP0694648A3 (de) 1997-05-28
EP0694648B1 true EP0694648B1 (de) 2000-05-31

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JP (1) JPH08199493A (de)
CN (1) CN1092736C (de)
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CA (1) CA2151642C (de)
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EP0694648A3 (de) 1997-05-28
DE69517253T2 (de) 2000-11-09
FI943040A0 (fi) 1994-06-23
FI102624B (fi) 1999-01-15
CN1092736C (zh) 2002-10-16
EP0694648A2 (de) 1996-01-31
TW357210B (en) 1999-05-01
CA2151642A1 (en) 1995-12-24
FI943040A (fi) 1995-12-24
ATE193569T1 (de) 2000-06-15
CN1120099A (zh) 1996-04-10
CA2151642C (en) 1999-03-30
US5575084A (en) 1996-11-19
JPH08199493A (ja) 1996-08-06
FI102624B1 (fi) 1999-01-15
DE69517253D1 (de) 2000-07-06

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